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Pollutant emission control sorbents and methods of manufacture

a technology of sorbents and pollutants, applied in the field of pollution emission control sorbents, can solve the problems of reducing the performance of activated carbon, introducing significantly higher costs, and not being as effective with elemental mercury, and achieving the effect of reducing the particle size of particles

Inactive Publication Date: 2009-08-18
BASF CATALYSTS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention is about a new type of sorbent that can remove heavy metals like mercury from the exhaust gas of coal-fired power plants. The sorbent is made by mixing a metal salt and a sulfide salt with fly ash particles, which are then dried. The resulting material contains a metal sulfide on the surface of the fly ash particles. This new sorbent can help reduce pollutants in gas streams and improve air quality."

Problems solved by technology

These acid gases have been shown to degrade the performance of activated carbon.
Though powdered activated carbon is effective to capture oxidized mercury species such as Hg+2, powdered activated carbon (PAC) is not as effective for elemental mercury which constitutes a major Hg species in flue gas, especially for subbituminous coals and lignite.
This, however, not only introduces significantly higher cost, but a disadvantage to this approach is that bromine itself is a potential environmental hazard.
Furthermore, the presence of PAC hinders the use of the fly ash for cement industry and other applications due to its color and other properties.
In addition, ion exchange is time-consuming and involves several wet process steps, which significantly impairs the reproducibility, performance, scalability, equipment requirements, and cost of the sorbent.

Method used

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  • Pollutant emission control sorbents and methods of manufacture
  • Pollutant emission control sorbents and methods of manufacture
  • Pollutant emission control sorbents and methods of manufacture

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of CuS / Fly Ash Sorbent (3% Cu) via Reactive Grinding

[0036]First, 0.29 g CuCl2.2H2O, 0.87 g CuSO4.5H2O and 10 g fly ash were ground together, ensuring that the copper salts are fully mixed with fly ash. Then, 1.25 g Na2S.9H2O was added to the above mixture and the mixture was ground again. The mixture became moist and turned dark as heat was released as a result of Reaction 1. Grinding was stopped when there was no more physical change. The sample was then dried at 110° C. until the free moisture was completely removed. The sample was then ground to pass through a 325 mesh sieve.

example 2

Preparation of CuS / Fly Ash Sorbent (1% Cu) via Incipient Wetness

[0037]First, 0.097 g CuCl2.2H2O, 0.29 g CuSO4.5H2O and 10 g fly ash were ground together, ensuring that the copper salts are fully mixed with the fly ash. Then, 0.416 g Na2S.9H2O was mixed in 1.60 g DI-H2O to provide a solution. The solution was added to the solid mixture drop-wise while stirring the solid vigorously. The mixture moistened and turned dark as heat was released as a result of Reaction 1. Mixing was stopped when there was no more physical change. The sample was dried at 110° C. until the free moisture was completely removed. The dried sample was ground to pass through a 325 mesh sieve.

example 3

Preparation of CuS / Bentonite Sorbent (5% Cu) via Reactive Grinding

[0038]First, 0.49 g CuCl2.2H2O, 1.45 g CuSO4.5H2O and 10 g bentonite were mixed together to ensure that the copper salts were fully mixed with the clay. Then, 2.08 g Na2S.9H2O was added to the above mixture, and the mixture was ground again. The mixture moistened and turned dark as heat was released as a result of Reaction 1. Grinding was stopped when there was no more physical change. The sample was dried at 110° C. until the free moisture was completely removed. The dried sample was ground to pass through a 325 mesh sieve.

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Abstract

Sorbents for removal of mercury and other pollutants from gas streams, such as a flue gas stream from coal-fired utility plants, and methods for their manufacture and use are disclosed. The methods include mixing fly ash particles with a sulfide salt and a metal salt to form a metal sulfide on the outer surface of the fly ash particles.

Description

TECHNICAL FIELD[0001]Embodiments of the invention relate to pollutant emission control sorbents and methods for their manufacture and use.BACKGROUND ART[0002]Emission of pollutants, for example, mercury, from sources such as coal-fired and oil-fired boilers has become a major environmental concern. Mercury (Hg) is a potent neurotoxin that can affect human health at very low concentrations. Mercury emission from sources such as coal-fired and oil-fired boilers has become a major environmental concern. The largest source of mercury emission in the United States is coal-fired electric power plants. Coal-fired power plants account for between one-third and one-half of total mercury emissions in the United States. Mercury is found predominantly in the vapor-phase in coal-fired boiler flue gas. Mercury can also be bound to fly ash in the flue gas.[0003]On Dec. 15, 2003, the Environmental Protection Agency (EPA) proposed standards for emissions of mercury from coal-fired electric power pla...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C04B14/02B01D53/46B01J20/00B01J20/10B32B18/00C01B17/22C01G19/00C22B3/00C01G23/00C01G3/12C01G45/00C01G49/12
CPCB01J20/02B01J20/0222B01J20/0229B01J20/0237B01J20/0251B01J20/0285B01J20/3236B01J20/28059B01J20/045B01J20/3021B01J20/3204B01J20/28004B01J20/0211Y10T428/2991B01J2220/42B01J2220/4887B01J20/0281B01J20/024B01J20/12B01J20/3078B01J20/3293B01J20/0207B01J20/0214B01J20/0218B01J20/0288B01J20/0244B01J20/0296B01J20/0248
Inventor YANG, XIAOLIN DAVIDTRAN, PASCALINE HARRISONSHORE, LAWRENCEMACK, STANLEY SCOTTSTAUDT, JAMES EUGENE
Owner BASF CATALYSTS LLC
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